A lot of people think that the only way to fight belly fat is to hit the gym daily. Let's face it, though; that's not exactly sustainable. According to one report, the average working American has a mere 4 hours of free time daily – time that easily gets swallowed up by social media, eating and commuting.The average American mother has it even worse, with just 36 minutes of free time each day. So yeah – an hour at the gym 5 days a week? Not likely. But what if I said you could burn belly fat right in your office, without even leaving your chair? Would you be interested? Of course you would! Check out the following 5 simple chair exercises from fitness trainer Denise Austin.